536 lines
16 KiB
C
536 lines
16 KiB
C
/****************************************************************************
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* net/udp/udp_sendto_unbuffered.c
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*
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* Copyright (C) 2007-2009, 2011-2016, 2018-2019 Gregory Nutt. All rights
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* reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_NET_UDP
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#include <sys/types.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <assert.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/udp.h>
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#include "netdev/netdev.h"
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#include "devif/devif.h"
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#include "arp/arp.h"
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#include "icmpv6/icmpv6.h"
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#include "socket/socket.h"
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#include "udp/udp.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* If both IPv4 and IPv6 support are both enabled, then we will need to build
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* in some additional domain selection support.
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*/
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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# define NEED_IPDOMAIN_SUPPORT 1
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct sendto_s
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{
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#ifdef NEED_IPDOMAIN_SUPPORT
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FAR struct socket *st_sock; /* Points to the parent socket structure */
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#endif
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FAR struct devif_callback_s *st_cb; /* Reference to callback instance */
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FAR struct net_driver_s *st_dev; /* Driver that will perform the transmission */
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sem_t st_sem; /* Semaphore signals sendto completion */
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uint16_t st_buflen; /* Length of send buffer (error if <0) */
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const char *st_buffer; /* Pointer to send buffer */
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int st_sndlen; /* Result of the send (length sent or negated errno) */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sendto_ipselect
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*
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* Description:
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* If both IPv4 and IPv6 support are enabled, then we will need to select
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* which one to use when generating the outgoing packet. If only one
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* domain is selected, then the setup is already in place and we need do
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* nothing.
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*
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* Input Parameters:
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* dev - The structure of the network driver that caused the event
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* pstate - sendto state structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* This function must be called with the network locked.
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*
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****************************************************************************/
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#ifdef NEED_IPDOMAIN_SUPPORT
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static inline void sendto_ipselect(FAR struct net_driver_s *dev,
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FAR struct sendto_s *pstate)
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{
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FAR struct socket *psock = pstate->st_sock;
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DEBUGASSERT(psock);
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/* Which domain the socket support */
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if (psock->s_domain == PF_INET)
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{
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/* Select the IPv4 domain */
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udp_ipv4_select(dev);
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}
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else /* if (psock->s_domain == PF_INET6) */
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{
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/* Select the IPv6 domain */
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DEBUGASSERT(psock->s_domain == PF_INET6);
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udp_ipv6_select(dev);
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}
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}
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#endif
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/****************************************************************************
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* Name: sendto_eventhandler
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*
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* Description:
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* This function is called to perform the actual send operation when
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* polled by the lower, device interfacing layer.
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*
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* Input Parameters:
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* dev The structure of the network driver that caused the event
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* conn An instance of the UDP connection structure cast to void *
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* pvpriv An instance of struct sendto_s cast to void*
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* flags Set of events describing why the callback was invoked
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*
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* Returned Value:
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* Modified value of the input flags
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*
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* Assumptions:
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* This function must be called with the network locked.
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*
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****************************************************************************/
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static uint16_t sendto_eventhandler(FAR struct net_driver_s *dev,
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FAR void *conn, FAR void *pvpriv,
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uint16_t flags)
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{
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FAR struct sendto_s *pstate = (FAR struct sendto_s *)pvpriv;
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DEBUGASSERT(pstate != NULL && pstate->st_dev != NULL);
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if (pstate != NULL)
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{
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/* The TCP socket should be bound to a device. Make sure that the
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* polling device is the one that we are bound to.
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*/
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if (dev != pstate->st_dev)
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{
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/* Ignore this poll. Wait for the right device */
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return flags;
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}
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ninfo("flags: %04x\n", flags);
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/* If the network device has gone down, then we will have terminate
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* the wait now with an error.
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*/
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if ((flags & NETDEV_DOWN) != 0)
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{
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/* Terminate the transfer with an error. */
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nwarn("WARNING: Network is down\n");
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pstate->st_sndlen = -ENETUNREACH;
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}
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/* Check if the outgoing packet is available. It may have been claimed
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* by a sendto event serving a different thread -OR- if the output
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* buffer currently contains unprocessed incoming data. In these cases
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* we will just have to wait for the next polling cycle.
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*/
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else if (dev->d_sndlen > 0 || (flags & UDP_NEWDATA) != 0)
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{
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/* Another thread has beat us sending data or the buffer is busy,
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* wait for the next polling cycle and check again.
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*/
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return flags;
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}
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/* It looks like we are good to send the data */
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else
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{
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#ifdef NEED_IPDOMAIN_SUPPORT
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/* If both IPv4 and IPv6 support are enabled, then we will need to
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* select which one to use when generating the outgoing packet.
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* If only one domain is selected, then the setup is already in
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* place and we need do nothing.
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*/
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sendto_ipselect(dev, pstate);
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#endif
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/* Copy the user data into d_appdata and send it */
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devif_send(dev, pstate->st_buffer, pstate->st_buflen);
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pstate->st_sndlen = pstate->st_buflen;
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}
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/* Don't allow any further call backs. */
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pstate->st_cb->flags = 0;
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pstate->st_cb->priv = NULL;
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pstate->st_cb->event = NULL;
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/* Wake up the waiting thread */
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nxsem_post(&pstate->st_sem);
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}
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return flags;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_udp_sendto
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*
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* Description:
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* This function implements the UDP-specific logic of the standard
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* sendto() socket operation.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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* to Address of recipient
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* tolen The length of the address structure
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*
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* NOTE: All input parameters were verified by sendto() before this
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* function was called.
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* a negated errno value is returned. See the description in
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* net/socket/sendto.c for the list of appropriate return value.
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*
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****************************************************************************/
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ssize_t psock_udp_sendto(FAR struct socket *psock, FAR const void *buf,
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size_t len, int flags, FAR const struct sockaddr *to,
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socklen_t tolen)
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{
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FAR struct udp_conn_s *conn;
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struct sendto_s state;
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int ret;
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/* If the UDP socket was previously assigned a remote peer address via
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* connect(), then as with connection-mode socket, sendto() may not be
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* used with a non-NULL destination address. Normally send() would be
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* used with such connected UDP sockets.
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*/
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if (to != NULL && _SS_ISCONNECTED(psock->s_flags))
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{
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/* EISCONN - A destination address was specified and the socket is
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* already connected.
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*/
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return -EISCONN;
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}
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/* Otherwise, if the socket is not connected, then a destination address
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* must be provided.
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*/
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else if (to == NULL && !_SS_ISCONNECTED(psock->s_flags))
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{
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/* EDESTADDRREQ - The socket is not connection-mode and no peer\
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* address is set.
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*/
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return -EDESTADDRREQ;
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}
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/* Get the underlying the UDP connection structure. */
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conn = (FAR struct udp_conn_s *)psock->s_conn;
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DEBUGASSERT(conn);
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#if defined(CONFIG_NET_ARP_SEND) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
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#ifdef CONFIG_NET_ARP_SEND
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/* Assure the the IPv4 destination address maps to a valid MAC address in
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* the ARP table.
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*/
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#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
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if (psock->s_domain == PF_INET)
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#endif
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{
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in_addr_t destipaddr;
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/* Check if the socket is connection mode */
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if (_SS_ISCONNECTED(psock->s_flags))
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{
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/* Yes.. use the connected remote address (the 'to' address is
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* null).
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*/
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destipaddr = conn->u.ipv4.raddr;
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}
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else
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{
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FAR const struct sockaddr_in *into;
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/* No.. use the destination address provided by the non-NULL 'to'
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* argument.
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*/
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into = (FAR const struct sockaddr_in *)to;
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destipaddr = into->sin_addr.s_addr;
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}
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/* Make sure that the IP address mapping is in the ARP table */
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ret = arp_send(destipaddr);
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}
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#endif /* CONFIG_NET_ARP_SEND */
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#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
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/* Assure the the IPv6 destination address maps to a valid MAC address in
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* the neighbor table.
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*/
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#ifdef CONFIG_NET_ARP_SEND
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else
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#endif
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{
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FAR const uint16_t *destipaddr;
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/* Check if the socket is connection mode */
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if (_SS_ISCONNECTED(psock->s_flags))
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{
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/* Yes.. use the connected remote address (the 'to' address is
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* null).
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*/
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destipaddr = conn->u.ipv6.raddr;
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}
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else
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{
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FAR const struct sockaddr_in6 *into;
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/* No.. use the destination address provided by the non-NULL 'to'
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* argument.
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*/
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into = (FAR const struct sockaddr_in6 *)to;
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destipaddr = into->sin6_addr.s6_addr16;
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}
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/* Make sure that the IP address mapping is in the Neighbor Table */
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ret = icmpv6_neighbor(destipaddr);
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}
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#endif /* CONFIG_NET_ICMPv6_NEIGHBOR */
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/* Did we successfully get the address mapping? */
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if (ret < 0)
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{
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nerr("ERROR: Peer not reachable\n");
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return -ENETUNREACH;
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}
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#endif /* CONFIG_NET_ARP_SEND || CONFIG_NET_ICMPv6_NEIGHBOR */
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/* Initialize the state structure. This is done with the network
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* locked because we don't want anything to happen until we are
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* ready.
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*/
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net_lock();
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memset(&state, 0, sizeof(struct sendto_s));
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/* This semaphore is used for signaling and, hence, should not have
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* priority inheritance enabled.
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*/
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nxsem_init(&state.st_sem, 0, 0);
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nxsem_setprotocol(&state.st_sem, SEM_PRIO_NONE);
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state.st_buflen = len;
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state.st_buffer = buf;
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#ifdef NEED_IPDOMAIN_SUPPORT
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/* Save the reference to the socket structure if it will be needed for
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* asynchronous processing.
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*/
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state.st_sock = psock;
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#endif
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/* Check if the socket is connected */
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if (!_SS_ISCONNECTED(psock->s_flags))
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{
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/* No.. Call udp_connect() to set the remote address in the connection
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* structure to the sendto() destination address.
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*/
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ret = udp_connect(conn, to);
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if (ret < 0)
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{
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nerr("ERROR: udp_connect failed: %d\n", ret);
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goto errout_with_lock;
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}
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}
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/* Get the device that will handle the remote packet transfers. This
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* should never be NULL.
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*/
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state.st_dev = udp_find_raddr_device(conn);
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if (state.st_dev == NULL)
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{
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nerr("ERROR: udp_find_raddr_device failed\n");
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ret = -ENETUNREACH;
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goto errout_with_lock;
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}
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/* Make sure that the device is in the UP state */
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if ((state.st_dev->d_flags & IFF_UP) == 0)
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{
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nwarn("WARNING: device is DOWN\n");
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ret = -EHOSTUNREACH;
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goto errout_with_lock;
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}
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/* Set up the callback in the connection */
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ret = -ENOMEM; /* Assume allocation failure */
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state.st_cb = udp_callback_alloc(state.st_dev, conn);
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if (state.st_cb)
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{
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state.st_cb->flags = (UDP_POLL | NETDEV_DOWN);
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state.st_cb->priv = (FAR void *)&state;
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state.st_cb->event = sendto_eventhandler;
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/* Notify the device driver of the availability of TX data */
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netdev_txnotify_dev(state.st_dev);
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/* Wait for either the receive to complete or for an error/timeout to
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* occur. NOTES: net_timedwait will also terminate if a signal
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* is received.
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*/
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ret = net_timedwait(&state.st_sem, _SO_TIMEOUT(psock->s_sndtimeo));
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if (ret >= 0)
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{
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/* The result of the sendto operation is the number of bytes transferred */
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ret = state.st_sndlen;
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}
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/* Make sure that no further events are processed */
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udp_callback_free(state.st_dev, conn, state.st_cb);
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}
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errout_with_lock:
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/* Release the semaphore */
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nxsem_destroy(&state.st_sem);
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/* Unlock the network and return the result of the sendto() operation */
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net_unlock();
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return ret;
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}
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/****************************************************************************
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* Name: psock_udp_cansend
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*
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* Description:
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* psock_udp_cansend() returns a value indicating if a write to the socket
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* would block. It is still possible that the write may block if another
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* write occurs first.
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*
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* Input Parameters:
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* psock An instance of the internal socket structure.
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*
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* Returned Value:
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* OK (Always can send).
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*
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* Assumptions:
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* None
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*
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****************************************************************************/
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int psock_udp_cansend(FAR struct socket *psock)
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{
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return OK;
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}
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#endif /* CONFIG_NET_UDP */
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